Pattern for ramming pipe-molds.



R. G. JAMES. PATTERN FOR RAMMING PIPE MOLDS.

APPLIOATION FILED rm. 26, 1913.

1,072,235, Patented Sept. 2, 1913.

Fla. 1

INVENTOR 6 ap/42: BY.

7? W ciyvmwyfi WITNESSES A TTORNE Y "ill flTATES ATENT @FTQE.

ROSWELL G. JAMES, OF LOUISVILLE, KENTUCKY, ASSIGNOR T0 UNITED STATES CAST IRON PIPE AND FOUNDRY COMPANY, OF BUR I GTON, NEW JERSEY, A. (JOB/P0315:-

TION OF NEW JERSEY.

FATTEB/N FOR BAMMING PIPE-MOLDS.

T0 (ZZZ whom it may concern Be it known that I, Roswnm. G. J AMES, a citizen of the United States of America. re siding in Louisville, in the county of Jefl'erson and State of Kentucky, have invented certain new and useful Improvements in Patterns for Hamming Pipe-Molds, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof.

My present invention relates to patterns for ramming pipe molds, and particularly to the construction of the pattern for a pipe mold of the type in which the molding sand placed between the pattern and the surrounding flask is compressed by the pattern as the latter is axially withdrawn from the flask.

The general objects of my invention are to provide a simple, durable, and relatively inexpensive pattern for the purpose specified, which comprises a less numberof relatively movable pattern parts than have heretofore been commonly employed, and in use will insure a desirable uniformity in thickness and compression of the molding sand along the length of the mold.

The improved operating properties of my pattern construction make it possible to produce pipes straighter and more uniform in thickness, and with less undesirable contraction of the pipes especially back of the pipe sockets or heads, than have been obtainable in practice with the generally similar pipe molds heretofore employed. My improved pattern in a preferred form permits, moreover, of a simple and relatively inexpensive adjustment to vary the compression of the mold forming sand.

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of the invention, however and of the advantages possessed by it, reference should be had to the accompanying drawings and descriptive matter in which I have illustrated forms in which my invention may be embodied.

Of the drawings: Figure 1 is a sectional elevation of a pipe mold containing a preferred form of my improved pattern con,

Specification of Letters Patent.

Application filed February 26, 1913.

Patented Sept. 2, 191?.

Serial No. 750,729.

struction. Fig. 2 is a plan view of the mold shown in Fig. 1. Fig. 3 is an elevation of a portion of a pattern of slightly modified constrnction; and Fig. 4 is a sectional plan of still another form of pattern.

In the drawings, and referring first to the construction shown in Figs. 1 and 2, A represents the tubular flask body, B the base or support therefor, and C the top plate detachably secured to the flanged upper end of the flask body as-by the clamping devices I). The top plate C is formed with the usual central aperture C for the centering rib E of the hollow head or socket pat tern E. The body pattern F is formed with upper and lower portions of different cross sectional. areas. The lower portion which is cylindrical and of the larger cross sectional area is connected to the upper and smaller portion by an intermediate tapered portion. In so far as above described the flask and patterns are of the usual type heretofore employed. The principal distinguishing fea ture of my improved pattern construction, as shown in Figs. 1 and 2, is the provision of longitudinally extending ribs G rigidly secured to the reduced upper portion of the body pattern F and adapted to fit snugly in the cylindrical guide surfaces E and E of the head pattern. The guide surfaces E and Ff are just large enough in diameter to permit the passage through them of the enlarged lower end of the body pattern. As shown in Figs. 1 and 2, the ribs G are detachably secured by screws G to the upper cylindrical section f of the body pattern. The section f is secured to a lower section f by the axial bolt P which passes through a bolt hole formed in the bottom of the section f and through a bolt hole formed in a cap f bearing against the upper end of the section f. The lower pattern section 7' is formed with a tenon portion f" entering the lower end of the section f, and with a shoulder f against which the lower end of the section bears. This shoulder forms the upper end of the tapered portion of the pattern. As shown the ribs G extend a short distance below the shoulder f on to the tapered portion of the pattern body. The section f" is formed at its lower end with guide surfaces f and f entering the centering socket formed to receive them in the sup port Bi. Preferably as shown, sectional.

hardened metal wear rings or bands H and I are mounted in grooves or circumferential recesses formed to receive them in the sectionf at the opposite ends of the larger lower portions of the patterns. These readily renewable and hardened parts locatergl at thepoints where the wear on the patterns is the greatest, materially prolong the effective life of the mold is closed. The body pattern F is then withdrawn from the mold through the central passage in the head pattern E. As the body pattern F iswithdrawn, the sand in the upper portion of the mold is wedged outward and compacted by the tapered intermediate and enlarged lower portionsof the mold ramming pattern F.

It will be apparent that with the construction described the pattern F will be accurately guided. during its withdrawal owing to; the engagement of the ribs G and guide surfaces E and" E during the initial stages and the engagement of the enlarged lower portion of the pattern F with said guide surfaces during the final. stages of the withdrawal. This accurate guiding is of the first importance, of course, in obtaining a sand mold of uniform thickness and compactness. The density of the sand in the upper portion of the mold will obviously depend on the aggregate cross sectional area of the ribs G and these may readily be proportioned to give the desired compression. Furthermore, when these ribs are detachably secured in place, as shown in Figs. 1 and 2, ribs of different widths may he used to vary the compression of the sand when such variation seems desirable. The formation of channels and ribs in the sand which receive and separate the pattern. ribs G and are ironed out by the enlarged" lower end of the pattern F appears to materially re duce the frictional resistance to the withdrawal of the pattern.

It will be apparent from the foregoing that the external longitudinal ribs extending along and formin a part of the major fluted portion of the body pattern in the preferred constructions illi-istrated' perform three separate functions:(l) They control the character of the sand compacting operation. They insure the alineinent of the body pattern during its withdrawal from the mold. They center the body pattern during the mold filling operation.

The longitudinal guide ribs should be ofthe pattern as shown in Figs. 1 and 2; on the contrary, they may well be made I spiral as are the ribs GA of the pattern FA as shown in Fig. 3. l/Vhile there is an advantage in many cases in having the longitudinal rlbs replacetable, 1t 1s satisfactory 1n some cases to cast the ribs integrally with the upper portion of the body pattern, as shown in Fig. 4, where GB represent ribs cast integrally withthe body pattern F ll hile in accordance with the provisions of the statuteshave illustrated and de scribed the best forms of my invention now l z-nown tome, it will be apparent to those skilled in the art that changes may be made in the form of the a-pparatusd isclosed with out departing from the spirit of my inven tion, and that under some conditions certain features of my invention may be used with-- out a corresponding use of other features.

Having now described my invention, wl'iat l clainias new anddesire' to secure by Letters Patent, is:

1. A pattern comprising a cylindrical portion of one diameter atone end, a portion of s1n=allc1-*'dzi-ameter at the oppositeend, and' a tapering intermediate portion, and provided on said portion of smaller diameter with longitudinal ribs extending along substantially the entire length of said portion of small diameter the outer edgesof said ribs being adapted to contact with a cylindrical surface of the same diameter as and coaxial with said cylindrical portion.

2. A pattern comprising a cylindrical bottom portion, an elongated fluted body portion adapted to contact with a cylindrical surface of the same diameter as and coaxial with said bottom. portion, but of lesscross sectional area by reason of its flutlng than said bottom portion and an intermediate portion ofthe samecross section at its lower end as said bottom portion and diminishing in cross section as the distance from said hottonr portion increases.

3. A pattern comprising a cylindrical portion of-one diameter at one end, a portion of smaller diameterat the opposite end and a taperingintermediate portion and provided with external longitudinal I'lbS running along SEllCl portlon of smaller di- "ameter and alongsaid intermediate portion, the outer edges of said ribs being adapted to contact with a cylindrical surface of the same diameter as and coaxial with said cylinderportion. V

A pattern comprising a cylindrical portion of one diameter at one end, a portion of smaller diameter at the oppositeend', and

a tapering intermediate portion, and provided with longitudinal ribs detachably secured to said portion of smaller diameter and extending along substantially the entire length of said portion of small diameter, the outer edges of said ribs being adapted to contact with a cylindrical surface of the same diameter as and coaxial with said cylindrical portion.

5. Pipe molding apparatus comprising in combination, a head pattern formed With a cylindrical central passage and a body pattern adapted to extend into the mold with its outer end received in said passage during the mold filling operation and to be Withdrawn from the mold through said passage during the mold compacting operationd and comprising a cylindrical inner end portion of the same diameter as said passage and an adjacent portion of tapering cross section but having the major portion extending into the mold during the mold filling operation fluted and adapted to it snugly against the wall of said passage as said body pattern is withdrawn from the mold through said passage.

ROSWVELL G. JAlllES. \Vitnesses .Enw. I. Kon'r'rnn, DENNIS GLnnsoN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

